Concrete repair
Rebar dowelling & structural anchoring with epoxy
BestBond EP751 is a high-strength, fast-curing two-component epoxy adhesive used to dowel rebar and anchor bolts into concrete.
Public technical guidance
This page is selection and sequencing guidance, not a project method statement. The current product TDS, approved design, site assessment and trial application take precedence; structural anchors, cracks, water-retaining structures and other safety-critical work require qualified technical review.
Applicable for
- Dowelling rebar and anchoring bolts and steel into concrete
- Repairing and patching cracks and honeycombing in concrete
- Assembling and bonding concrete, natural stone and engineered stone
- Bonding stone to other high-strength materials
Substrate requirements
- Check concrete strength, member thickness, existing reinforcement locations and cracking against the anchor design
- The drilled hole must be sound, dry and free of contamination
- The rebar to be installed must be cleaned thoroughly, free of rust, dust or other contaminants
- An approved design/method defines hole diameter, embedment, edge distances, loads and acceptance sequence
Step-by-step procedure
- 1
Drill the dowel hole
Locate existing reinforcement and services before drilling. Drill the approved diameter, angle and embedment; do not default to a 10–12-bar-diameter rule for every load and substrate.
- 2
Clean the hole
Blow or vacuum the hole for initial cleaning, then use a brush to remove remaining dust, and blow or vacuum once more to ensure the hole is completely clean.
- 3
Mix BestBond EP751
Weigh components A:B = 2:1 by weight and mix at 300 – 400 rpm for at least 3 minutes until homogeneous. Use within the TDS working time at an ambient temperature of +15°C to +35°C.
- 4
Inject the adhesive
Inject from the bottom outward to avoid air pockets. Calculate resin from the approved hole and bar geometry with a waste allowance; do not rely on a generic holes-per-kilogram figure.
- 5
Insert the rebar
Slowly insert the rebar while rotating it in a spiral motion for easier placement. Ensure that when the rebar reaches the bottom, adhesive overflows evenly at the mouth; if not, withdraw the rebar, re-inject and re-insert.
Consumption is calculated from the annular volume between hole and anchor, embedment, hole count and waste. Detailed load/rate values belong to the approved design and require acceptance or pull testing where specified.
Common questions
Which adhesive should be used to dowel rebar and anchor bolts into concrete?
Use BestBond EP751 — a high-strength, fast-curing two-component epoxy adhesive suitable for dowelling rebar, anchoring bolts and steel into concrete, natural stone and engineered stone.
How is BestBond EP751 consumption calculated for dowelling?
Calculate the hole volume minus the anchor volume over the embedment, plus installation waste. Hole diameter and embedment come from the approved design; a generic holes-per-kilogram table is not a universal commitment.
How long after installation can the rebar carry load or be pull-tested?
Do not load or pull-test against a generic time. Follow the TDS at actual temperature, the anchor design and the approved test/inspection plan; EP751 mechanical properties are published after 7 days of curing at 30°C.
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